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' SECTION 02304 <br /> ' CEMENTED COQUINA SHELL BASE COURSE <br /> 1 . DESCRIPTION <br /> ' A. Under this item, the Contractor shall furnish all equipment, labor, materials, and <br /> transportation necessary to construct a Coquina shell base course upon the <br /> completed stabilized subgrade . The base course shall be constructed in <br /> accordance with the lines , grades , and typical section as shown on the Drawings . <br /> Unless otherwise noted construction shall conform to the provisions of Florida <br /> ' D . O . T. Standard Specifications for Road and Bridge Construction, Section 250, <br /> 1991 Edition. <br /> 2 . MATERIALS <br /> A . Coquina shell shall conform to the requirements of Florida D . O . T. Standard <br /> Specifications, 1991 Edition, Section 915 , and shall be from a source acceptable to <br /> Florida D . O . T. The material shall have a minimum LBR value of 100 . Prior to <br /> placement, the material shall be crushed or broken to such a size that no less than <br /> 97 percent by weight will pass a 3 1 /2 inch sieve and no more than 20 percent dry <br /> weight shall wash through a No . 200 sieve . No visible clay or organic matter will be <br /> permitted . <br /> 3 . PLACEMENT OF MATERIAL <br /> ' A . After the subgrade is completed and approved, the Contractor shall furnish and <br /> spread the coquina shell in a uniform distribution. Spread thickness shall be a <br /> minimum of 8 inches . Segregated areas of fine or course rock will not be permitted . <br /> ' Such areas shall be removed and replaced with properly graded rock. <br /> B . After the spreading is completed, the entire surface shall be scarified and <br /> ' shaped so as to produce the required grade and cross section after <br /> compaction. <br /> ' 4 . COMPACTION <br /> A . The required compaction of the coquina shell base course shall be a minimum of 98 <br /> percent of the maximum dry density . <br /> B . No less than 8 - 10 ton steel drum or pneumatic tired roller shall be used to <br /> ' compact the base course . All depressions shall be filled and the process of <br /> rolling and filling shall continue until a thoroughly compacted uniform <br /> ' surface is produced. During final compaction operations , if blading of any area <br /> is necessary to obtain the true grade and cross section, the compaction operations <br /> for such areas shall be completed prior to making the field density-compaction test <br /> on the finished base . <br /> C . Should the subgrade material become mixed with the base course material at any <br /> t CADown1oad\techspec-02304 .doc 02304- 1 <br />